Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021GL094223 |
Replenishment of near-surface water ice by impacts into Ceres’ volatile-rich crust: Observations by Dawn’s Gamma Ray and Neutron Detector | |
T. H. Prettyman; N. Yamashita; M. E. Landis; J. C. Castillo-Rogez; N. Schö; rghofer; C. M. Pieters; H. G. Sizemore; H. Hiesinger; S. Marchi; H. Y. McSween; R. S. Park; M. J. Toplis; C. A. Raymond; C. T. Russell | |
2021-07-21 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Ceres’ regolith contains water ice that has receded in response to insolation-driven sublimation. Specially targeted, high spatial-resolution measurements of hydrogen by Dawn’s Gamma Ray and Neutron Detector (GRaND) reveal elevated hydrogen concentrations in and around Occator, a young, 90-km diameter, complex crater located at 19.82N where near-surface ice is not expected. The excess hydrogen can be explained by impact excavation of water-rich outer crustal materials and their emplacement in the crater floor and ejecta blanket. This is supported by thermophysical models that show water ice could survive at sub-meter depths, given Occator’s relatively young age (∼20 Myr). We hypothesize that the regolith can be replenished with ice from large impacts and that this process partially controls the distribution and depth of near surface ice. This is supported by results from Occator and similarities in the global distribution of hydrogen and the pattern of large craters (20-100 km diameter). |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/334092 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | T. H. Prettyman,N. Yamashita,M. E. Landis,等. Replenishment of near-surface water ice by impacts into Ceres’ volatile-rich crust: Observations by Dawn’s Gamma Ray and Neutron Detector[J]. Geophysical Research Letters,2021. |
APA | T. H. Prettyman.,N. Yamashita.,M. E. Landis.,J. C. Castillo-Rogez.,N. Schö.,...&C. T. Russell.(2021).Replenishment of near-surface water ice by impacts into Ceres’ volatile-rich crust: Observations by Dawn’s Gamma Ray and Neutron Detector.Geophysical Research Letters. |
MLA | T. H. Prettyman,et al."Replenishment of near-surface water ice by impacts into Ceres’ volatile-rich crust: Observations by Dawn’s Gamma Ray and Neutron Detector".Geophysical Research Letters (2021). |
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